This is where I got annoyed at both Bluesound and Tidal. They are very careful with their wording on this issue. I had to email them both multiple times to get a straight answer. They seem to be intentionally misleading.
Tidal is "integrated" into the BluOS. So you can stream mqa from tida; usiing only the BS Vault. And Tidal has flac thru Tidal Connect on the Tidal Connect app, that you can stream through the Vault - wirelessly. But you cannot access flac direct from tidal thru the Vault.
My BluOS app was just updated after an update prompt, and the Tidal Connect app was just released.
So now, I subscribe to both Tidal and Qobuz. I stream Qobuz hi res flac direct thru the Vault, and when they don't have a flac option available I stream mqa from Tidal. I see no reason to use the Tidal Connect, unless / until they "integrate" into the BluOS as they do with mqa Tidal